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I did a Flowmaster 10 series turned down and it's fairly loud with very little drone. I've $200 into everything from the flange back. That includes 6' of 3" tube, 1 muffler and a turn down.
I had a few executives from Magnaflow and Rutledge Wood's in my truck one night and they kept telling me how great it sounded, then I finally told them it wasn't one of their products. Basically what I'm saying is if it impressed them it was well worth the $